<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        var p = new Promise(function(resolve, reject) {
            setTimeout(function() {
                var flag = false
                if (flag) {
                    resolve('正确操作')
                } else {
                    reject('错误操作')
                }
            }, 100)
        })
        p.then(function(data) {
            console.log(data);

        }, function(info) {
            console.log(info);

        })
    </script>
</body>

</html>